I don't think it's really inappropriate for any age, but I don't know that anyone 15 and under would really comprehend/appreciate it.
I rushed tonight around 6:30pm, and got a balcony seat. Technically it wasn't rush as the balcony is being sold for $20 for the previews. I think it's a great view. Sat up there for many shows and I wasn't disappointed in the view. Plus, they're pretty open with you changing seats before the show as it was fairly empty.
The show itself is heavy. I didn't know the story going in, so it took awhile for me to totally get engaged, but by the end I was fully committed. The staging is super simple, and the only downfall of the balcony is that people further upstage are cut off from the looming black box. If the black box had been raised by 2ft, you'd be fine, but alas, you loose heads when they're upstage. Which really isn't an issue.
I agree Strong is really amazing, and overall I found the acting really engaging and interesting. But, the accents are terrible. I feel like, since they're doing it on a stark set that doesn't help locations, and modern dress, basically, why not just drop the accents and do it in their native tongue? Who cares? It won't really take away from the story. Fox was the highlight for me, but her accents raged from Irish to Cockney to Southern throughout the show. And woah, is to Tovey a looker. Even from the balcony I was taken by his looks. He's not the greatest actor on stage, he's a little too over the top with his part, but when he takes his shirt off.... yes.
I thought the direction was both graceful and a little heavy handed. It's a production that seems better suited for BAM than a commercial Broadway run, but hopefully it finds an audience.